SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c42c030a448dd0369e33b05827d3fc4d259bc535d9b71fe00715b7e36e216ed8' 
  AND token = 'hp2NZeqIBd7ZhfQWFb8lXIKe+HblVE44zs2c6VNgmQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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