Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66f4ecb8faff65aafe6454b8c2e698f57f873cce7264930447e186674225a084' 
  AND token = '9byYtcYairaezdAyaqJqDIBNnW/RoU4hVX8K0WjfGgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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