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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea2f4d901103e03665c93eee2917b447f22670c4dd26cdf948e4265d4fcc666' 
  AND token = 'L1/2t+lsdEO/PKaxzCQoJJYbAM5TgA/d9zSmaPx5xtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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