SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd40b07d5a3f0d8524aaca46253714b08b79b072abb9e3d740864c3b6f0249a3' 
  AND token = 'zh5KbqJOHl3wLh1TDPqvH5XQ6+20VrlQrcna0mIj94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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