SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5adf600546c61ef891fa5d2793d9dbba68fe949d74d646ea5997614c58caad8e' 
  AND token = 'BdrRXPeJ52SmHX06s++XwiiwgNZgtDMQqYhWWbCBmnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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