SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a410fb9937b85fa700175af4d499fdcd943891c387577efe39626bec5bad831' 
  AND token = 'qF/15fVjfHuLZwlhZTm28hxvQfeWASrxQZD5imsT7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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