SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473fe2e703bb6d6c1b96f5acac827450629484b2191b6627ad4b306949194162' 
  AND token = 'JxQchpAyiF/sYXfIAvloEsZzN+VU3fyJsFRGIVHh4fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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