SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9852cf287538c1d5b31c51f769d9fdb93d071b0dc3888b3cce340438d3535e40' 
  AND token = 'hfIBGakYDpKugITjz1hr5RJns+5TJKCjL5/oyqDSFvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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