SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe65d399a4c17b45bbf6a2f9381195377ae848787b21e37ea17276e957014c35' 
  AND token = 'TvPK/TfaZueQ1INmqr9xallxYsleZQNIhwJe5WwGLyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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