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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf6221bf8dc24a34d723edf45dda87c5ce8eee63d6e10b5c42ea682bdc81187f' 
  AND token = 'YUxixWHqGmKxvDcwHHUSw7gKNLfOZTEOE/xBKxTv1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}