SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f3ac46840a4af31cf8243b796292fcc165e855fb10bc42a77a0cf82e15d8d26' 
  AND token = 'x1qwsNLrZCkG2dKKkqdhcWLKrhJrMw3v73jyVazie7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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