SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91661297144d95752e1f9e47f024c009dcad61d3ae6b3dbf634d58ce4fb33368' 
  AND token = '6WO/gY9ogKRKgwgj7H1T/LH6k5Q3Uzg2ylHBTVX0eFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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