SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee7da1b5abd1ae3a147293b9f918455c2bc4361c8ca6dd668bb634606a1718cd' 
  AND token = 'pyMme500/KhBpiW6JfbzSBKGdZhT+7mldFKlwYLsuBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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