SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39c17ad65f72b3a1b212de56bda45b635967604fb2b94fab6a8f85fd5997f316' 
  AND token = 'g688jgT1AmgyeqEF+wNc4kNd2K2siM2/ppsx+VzNHhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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