SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '657adb84f0967d92651f27828697aac604dc5361fec67eae1660743984282a60' 
  AND token = 'ewOdCLO/9vjiSXKgl0uwsliSwx9RjziGWVYQdoyst2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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