SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '227f53f5d7aa87f96972bee428597c8bb559422749686748b92cbc8b76a394b3' 
  AND token = '6YEuhoGJRPtkgnVc+xjnPixgZMkD0AdIpwEQ4pEgKcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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