SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d3cdaba4c558fa9c2d187015fdfc80bcf4815b639c05bfa8ab9caca555de5bb' 
  AND token = 'V+l6ek4KuUYnmZhmBqDuG/p4S8IfYNpg2yUV4QtAYEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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