SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73088eccc5ca6607af74271bb30acc25d56b6ef9b10ca4ca665e270289eb5828' 
  AND token = 'N7f1FHrhy8CXS4hhzlTsMHMIsFKqvJ7jWnHzfWUU+vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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