SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69e1727c1cc2ef7118c075c93d07ef1118b79999d15f63934806019b8f35b06' 
  AND token = 'QsHmynowHu0OTypKgW5uR3YmJ5aEo6EwO/ljzj12ZIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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