SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a80716d80a9dccb4aea55a5abdc70c594379ade50691c2bbe85f81e3bcb66dbb' 
  AND token = 'od6PwRK9oFKGZeJj//4Yw2h9By0crqgWnNIx/fskg3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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