SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fe5243c043987fc51b04993c250c8afce9d0068fa3b418d5b82756408d3dcbc' 
  AND token = 'K2l6n6qmfCWVYkT97/w/BkB9mGvoDXTfZrFdyYPJ6xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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