SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ee5c998ae670f44086621a9d851167b5281c62fed81f6ce3b10ae36867a6c6' 
  AND token = 'sDj0YVngJCNRxOfc4lg/v/hH9bJudbeOnFXh9+6G3XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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