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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccd21e208224c7930eb39fe3495924e6c52737fdb20ed0728fc841422ba549eb' 
  AND token = 'Wqetr8cVRb7ai9kRJrKrSeE9uofxqWqHm8pz17IRCwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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