SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8729a1cb520845a9da6516b40e8c230957f7cca59ed1b19c3c110ccd7537bd06' 
  AND token = '7uFpaQtZXJrrAsJ5VB/g1Hf0TJI5ZNoYqIlrY/G58vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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