SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f33b2999fef500d93cc7057391f8137b27fed5f6e22c769464a5c7e2a811f70' 
  AND token = 'LW/MuVg5V37SJcrkgz4ZK6xyZDpjrX6QNzU7ATt0OC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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