SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b5181019ef48de95168627f79b3d55ebf531dfe8d164dfe2b43ed99fd194d5f' 
  AND token = 'lJzziKk+3YjrYMWC/TH4WoZUs8BCVGPryIrSKtFCHAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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