SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a131a30689e6b24a7cb8cc7e19b1df044589a19ee5e0b9003ece1567d58b575d' 
  AND token = 'GnNW41GZh4iUcL8HBDoKHVZBJ6F+Tx+JdfjYItqPIC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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