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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9674f2aee012a11c07d7096788a4dfeaf3ec5a2fa3e291906d50967b2edf80ad' 
  AND token = '3W1a/nMq25/h19nb0jWI/HVGyJSjUDLjS6J5gtwJ8RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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