SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9905f326db1b850f1fa775d24721bd3bc3aaf850bde114f14b20cc639a273c18' 
  AND token = 'iPH/6rizC/k/Buj+AnBAmVGh0SkeRbFUoo2plOUSrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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