curl --request GET \
  --url http://localhost:9001/api/v1/accounts/{account_id}/users/{user_id}/keys \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "keys": [
      {
        "id": "<string>",
        "key_name": "<string>",
        "masked_key": "aion_sk_...xyz789",
        "scopes": [
          "<string>"
        ],
        "is_active": true,
        "last_used_at": "2023-11-07T05:31:56Z",
        "created_at": "2023-11-07T05:31:56Z"
      }
    ]
  }
}