Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a786afde6175ba3ce9d3c75b2b68cd07afc460fb3031a8ec9fa041f769aca3ca' 
  AND token = 'DIw22ob0gW1xuMWAUfBFVgy3+Cz22EKKJkg70LuCgFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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