SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab8e72473a95f198c78311c88184c9f30418611258440f9f7c21432dabc8b939' 
  AND token = '0ylZMHJm2hxnSQ4mECb7zlUpJvBpf4qvUuzVLtFF358=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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