SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44c5d0ae241f5aa8cc0f44652a2280f8806717937d8eb84bac65bbae58cc1a06' 
  AND token = 'xCYnHQhgIWAoXv+e9VbxrP8j7TJl+DqBHFOdSst5+Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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