SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d19374652adb176340bc6341fb9c1771a8a0246d92fd13861a58b5163a7312c' 
  AND token = 'FNLs2EbJ/hC8OxUMjheSe2yq7oCn9AG//N4bBUXlwUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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