SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86d6b782fbfdc9550b0897751f62e69cfff629e17d7040b3c985c26285753870' 
  AND token = '/Yv3UkVxO2OwNMhRTnu8oSrz/IRFxuURB1qEEakVJ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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