SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f12a1134abb3cf6aec89408a25980b9d8f2f3bf2039f1d7ef279908b48f1e88' 
  AND token = 'U/oYDhwv/vebwlLXZV4VX8Helw5fFdvhtXCLxRNwqKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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