SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0df080519be94cf2d28d332b84b554d86103ec61222bf2e862bd4e65b5d31408' 
  AND token = 'ii1ynNYfcHv+ZWlX9HGEUnKTYsD0/rhf/7MePpSBvTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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