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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e0f3cc7e22cf4de6946e6966e34701c69e824b7ab70535598ad62d9f15e0db0' 
  AND token = 'IUYVMbKttToH9F7eAkmgir1f9b6iWADg/BRtPNp/+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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