SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '218e3ebd6c14f8b333bb8996cb635d7b29887f673cdbb80aae074f171749c7f7' 
  AND token = 'QElwJRkHA+oMjIzxy0Q83jrBY16mB8ltB+YhVhLVnX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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