SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ab2d9aa5485fe6aad735b91d4a29857ced2ae51664bf83675c4f659680dead8' 
  AND token = 'OXsHZvS6CzmlF8Hgr/PEgxEdnC2JBG5El7wmg+Sdwts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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