SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61ad69318c4d462a928069c349e5985923c213775f9f87b5d69febb8257d73b5' 
  AND token = 'SWT+xoiHi+fJuhK4r0xphbmrkuSd/ubOBnFqg4R4vBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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