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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e1adee999aaa6966ebb303b1235838e21136dd87f7f30dc470ab71dc007371' 
  AND token = 'BWmR4DlIBB650L8PBbgxYXPKhLxgXg5zk5mAmT/xEY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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