[HWORKS-2804] Add expiration date for API keys

docs/user_guides/projects/api_key/create_api_key.md

@@ -20,6 +20,8 @@ In this guide, you will learn how to create an API key.
 ### Step 1: Navigate to API Keys
 
 In the _Account Settings_ page you can find the _API_ section showing a list of all API keys.
+The table shows each key's name, scope, prefix, creation date, last modification date, and expiration date.
+Keys with no expiration show _Never_ in the expiration column.
 
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@@ -30,9 +32,20 @@ In the _Account Settings_ page you can find the _API_ section showing a list of
 
 ### Step 2: Create an API Key
 
-Click `New Api key`, select the required scopes and create it by clicking `Create Api Key`.
+Click `New API key`, enter a name, optionally set an expiration, select the required scopes, and click `Create API key`.
 
-Copy the value and save it in a secure location, such as a password manager.
+**Expiration options:**
+
+| Option | Description |
+| -------- | ------------- |
+| No expiration | The key never expires (default). |
+| 7 / 30 / 60 / 90 days | The key expires the selected number of days from now. |
+| Custom | Pick a specific date using the date picker. |
+
+To change the expiration date of an existing key you must regenerate it — expiration cannot be updated after creation.
+
+Copy the key value and save it in a secure location, such as a password manager.
+It will not be shown again.
 
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