SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee8d9eb26a36337d41437439cbb57addc67f6b7f62b6d9df056c31cd77f16444' 
  AND token = 'jPIGXU6izyqvTVsS1V/dBn/sb+n3bZXJ7KP/3LgH15w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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