SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac4d601c7715694cb5c3c04901addb8786ff98824cc66758ddb82a6b3044018f' 
  AND token = 'PpCuQeybsAX7VYKdpw4knHXOtx+aaBvi1ffUD3qwsgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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