SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b09496b6930393255d0724122a81425a077597dc740860ac2a9dd77df1de22' 
  AND token = 'cqm9M/nDaiAwVGBwvAam/GEfTPxplPsEN4LOVKlOeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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