SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f1e3b02ad2184cd681ffd3f5317ac2ff485ba104cddb4b30f187afbac198fda' 
  AND token = 'FzH86mNVOG1p8bXPQYJDCjvS/GIzZc9txUMKbVXLNOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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