SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39630d7627489575bb3ee976ae579b5df0f79d7fce910f843d08fb824e1aaf02' 
  AND token = 'xSYvEq8amgmHD34E726t7K0ZbOOrxjhTEpZ0hjZvztU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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