Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e446b2f3e9a733951a389d64728e50863a5d0be29760ad81b96c7b47604856cf' 
  AND token = '+Y670OPMODcIrV2h+4nOIDjFpM3igEPNbaevlyQhmYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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