SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '432d80b6c96407d3d2cf720ec95545ead643ffe7e0c545284ad3a310ab3438fa' 
  AND token = 'R6K/EBlaOAtbhViwnMzUYB9Ph3C//3uG8UdCuHBRB0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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