SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '641719c34d3a483f973c7b9b1580d6d3db2f8448e1398303a2b4255e727bf217' 
  AND token = '/JIgOmCWAa1EKSIsxZNLJFESDQaeSbSDKFJXmQ6yh6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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