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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dc204a8a0914d74ea3892c43905d6e02aa9ea66ba7b9dfd85c259bdcd3e2773' 
  AND token = 'jtGA7MjJ9Zn6LWu27EY3U/8R6BL02w7tVJ6TIGylbyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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