SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7cbc5d0c548ae4669f68fd28bfa8464938f67f43ee658a4ce313b7f48b40809' 
  AND token = 'V4fpzFUqeZvC68z/DyR7BTWwy72fJWAJbHtTSC+PVNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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