SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e21bfd46dbfc8ce27c5777d395d3b5d28fd4466fa32671157b2673df88bfacb5' 
  AND token = 'B+1825dIBYlhio3huDZzPRZyKRfM+Ou62//Ocj9zziM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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