SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb421dbc6002eb19145cfa3d9ee934336de59338d407b2eaf35aa5c248f5a32' 
  AND token = 'yA08eiApT9F5sfS4zu/+B8HY1vm8eV/QGVYzjSPC7u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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