SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440a32d07761210565ab4bee85158fa9f855a4d084611213913a3d492c4a4bf8' 
  AND token = 'Fj4CzBmQBJXwqmz/76ve/9kGgl2A/jcDZZw5pS/8mfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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