SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '712dc566146d334defc697a104e06f1844fe2d5707f8f21ee96647a3321621c7' 
  AND token = 'MwJAZCygJ3ctV569p/n2GYQlx/zOs7oL50v7rTLKzZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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