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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43b43234dc95958028d386c5d02e9fb7230b511ebe6260b09aa5ea7e23b58d1c' 
  AND token = 'NnL/D3XmF/kfVOUz3AHI2dpPyPUIdgiIkY9j698IxeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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