SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3623fccffb7906ad7e61d24a60f28fbf906aa1b715541a5a24a0acf2e7bb0efe' 
  AND token = 'BDJtX+/adTsaBqOCgBYggziJ5APkoFYpLQrshPKH3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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