SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '781eb977330919277ceb4be2f52b4e8176193094cf43d37455fb56033356591b' 
  AND token = 'xqESldaT5+KxpQJgMLHFxXlmjmaqgkrwjL8WFljTLTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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