SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b89218b967d5c03ddc11e4c3f9ed846e8e554e7817a3dd0e95824662f2da237' 
  AND token = 'o0JsNhqc75gpD8Uow+C/+GWyeal+EKZQ5hLaJvuO1zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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