SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8d3290ce14c490209b549ad5fe3c5c1ff928f7b426e7d5d35f8f2a56737e677' 
  AND token = 'APjRWPIdniYwaU+IRN+DYhZoYyv+nRGOYsiX9M7dfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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