SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd3c4f44b672c665fc2650f1fb9894ba074e41a048f7d2abb26525eff86c3c73' 
  AND token = 'yvmGbOuB9MhVPHIp81iF+fGj6xSyzgIMRY0gmn3d+Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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