SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd77a85c078802883361f526f79028b47c1322436b73e0b63a2287e23128c1461' 
  AND token = 'w0cEZASyI0cKk5/eWkH+CVHZjjNbJqd+QYjAwzrGCGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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