Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecc9da2b7f1dd0a61bd5c9c4d6c75af6d0c55128a44ea67e0f240b0496322e6d' 
  AND token = 'N/OKvseRljrTTrUcuPzOyLEPJTT0KXZogrsP+WwOvso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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