SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '468c1d7d5ef06ae0b865c3173400411c7b00d9d2ad23c2b6a3be053c0ea8f7f8' 
  AND token = 'wjZ6Trc28Pdx1XVLHDxxvHcJzrGg6lk3YGuN2szLaWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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