Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d1e3b2fdecf85befaad98d0fd0886f9820cd6731181fc3ef0e0fd4efca0fb88' 
  AND token = 'k+ZoHWCC9VbFreIfpqNUi+YgbEhE2UwRx7O3h4e+mEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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