SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '605df5b7b9b01edfc9c06fe68f13e3dd8bc4bd137a140aa8a03f09f2706189e7' 
  AND token = 'AznG73In2F+TwRrRJ2RT8V7KaFxxIB21X8PH84Glbvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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