SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c47b454327909178f6a028ec554940552d3b1d96103b75e8b1e402090ad3fe' 
  AND token = 'BDJG2hj/UPwyoNqK2Khw/edlw1NATSl+vRzsTz7A2OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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