SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '892d763fbf47a73b97808aa90e0464c94af336f72038b41f19bf5452aa3805c0' 
  AND token = 'X0J1YfTiDqTmp6CfMegBzXXjEtWDrvSZkEOiyKj/+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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