SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '533cc34c69f6dcd0401bcc5759e4ecd4274ab76141794a8ac2511c468f7771e3' 
  AND token = 'L+9/T45+hCtE3qQMfLR5jzezlaodvJPSGDjr6wbX4uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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