SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baaf898a23109104eb0db85683b098726d9e1ea87e28610945f661538e3a74a6' 
  AND token = 'LOjIZYvpCaVhQmg+jYsuKQ1hDI9MGuCzc6KSZnPmypo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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